In order to operate on Windows Server 2025 Domain Controllers, it will be necessary to run AuthLite 2.5.20 or newer. If you install an older version of AuthLite on Server 2025, or upgrade a server running an older AuthLite to 2025, it will go into a boot loop. If that happens, either remove the AuthLite install or rename C:\Windows\System32\CSALsubauth.dll to any other name (e.g. append an underscore).

  • Recall that in general, DCs should be running the same or newer version compared to other domain member machines. It's a good idea to converge all DCs to the same build.
  • It is permissible to run a newer version on your DCs than your domain members, and to have different members at different versions.
  • To upgrade a server's AuthLite version you may simply install the newest version from the Downloads page over the existing version, then reboot servers (one at a time).  All configuration and keys will be retained.